See Also Examples Applies To
Return the three parameters that define a Range for a TWAIN capability. Many capabilities allow users to select their current value from a range of regularly spaced values. The capability can specify the minimum and maximum acceptable values and the incremental step size between values. For example, resolution might be supported from 100 to 600 in steps of 50 (100, 150, 200, ..., 550, 600).
Syntax
object.TwainGetCapRangeNumeric (nCap, *nMinValue, *nMaxValue, *nStepValue)
The TwainGetCapRangeNumeric syntax has these parts:
| Part | Description |
| object | Required. An object expression that evaluates to an object in the Applies To list. |
| nCap | Required. Long A TWAIN capability constant. |
| *nMinValue | Required. Double. Output Starting value in the range. |
| *nMaxValue | Required. Double. Final value in the range. |
| *nStepValue | Required. Double. Output Increment from nMinValue to nMaxValue. |
Returns
Boolean. True if success, else False -> use TwainGetLastResultCode() and TwainGetLastConditionCode() functions for diagnosing the error.
Remarks
Before using this function check that the TWAIN state is >= 4 (TWAIN_SOURCE_OPEN)
To get the TWAIN state, use the TwainGetState() function.
This fuction can be used to set the folowing types of capabilities: TWTY_INT8, TWTY_INT16, TWTY_INT32, TWTY_UINT8, TWTY_UINT16, TWTY_UINT32, TWTY_BOOL.
You can determine the type of each TWAIN capability using the TwainGetCapItemType function or looking the twain references from http://www.twain.org
Category
TWAIN Functions
Visual Basic Sample
Gets supported Brightness values
Dim bSuccess As Boolean
Dim nMinValue As Double, nMaxValue As Double, nStepValue As Double
Dim nCpt As Long
bSuccess = Object.TwainGetCapRangeNumeric(ICAP_BRIGHTNESS, nMinValue, nMaxValue, nStepValue)
If bSuccess Then
For nCpt = nMinValue To nMaxValue Step nStepValue
'Here, you can catch & store the nCpt value somewhere
MsgBox "A supported value are: " + str(nCpt)
Next nCpt
End If